orders-service

writes PaymentCreated v1

billing-service

reads amount, currency

fraud-detector

reads amount

notifications-worker

reads currency

order-read-model

reads unproven

PaymentCreated v1, 4 consumers in production

Detect
Expand
Dual-read
Dual-write
Contract
Done

Change the event. Keep every consumer.

Illustrative migration: PaymentCreated.amount becomes a Money message.

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